About Healthy Life Scale

Free tools. No account. Your data stays with you.

What this is

Healthy Life Scale is a small collection of free, focused health and wellness calculators — currently 17 tools covering everything from BMI and calorie tracking to blood pressure, heart age, sleep, pregnancy, fertility, mental health screening, and a symptom urgency checker.

Each tool is built to do one thing well: take a few real inputs and give you a clear, useful answer in seconds — grounded in established formulas and guidelines (things like the Mifflin-St Jeor equation, AHA blood pressure categories, IOM pregnancy weight guidance, the ACC/AHA ASCVD risk calculator, and the validated PHQ-9 / GAD-7 screening instruments) rather than anything invented or proprietary.

Why it's built this way

🔒 Private by default
There are no accounts and nothing is stored on a server. If a tool tracks history or trends (like a BMI log or sleep tracker), that data lives only in your browser's local storage, on your device.
⚡ Fast, no friction
No sign-up, no email gate, no app download. Open a tool, enter your numbers, get an answer.
💰 Free to use
Every tool is free. The site may eventually show ads to help cover hosting costs, but the tools themselves are never paywalled.
📜 Grounded in guidelines
Each calculator is built on established, public medical/scientific formulas and guidelines, referenced on its page — not on made-up scoring.

What this isn't

This site is not a medical provider, and none of these tools diagnose, treat, or replace a clinician. They're meant to help you understand your numbers and decide how urgently to seek care — not to tell you what condition you have. Always talk to a qualified healthcare provider about symptoms, test results, medications, or anything you're concerned about.

In a medical emergency, don't rely on this site or any online tool — call your local emergency number or go to the nearest emergency room right away.

All tools

Calorie Tracker
Search 240+ foods and track daily calories, protein, carbs, fat, fiber, sugar & sodium.
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BMI Calculator
Check your Body Mass Index and healthy weight range.
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Body Fat % Calculator
Estimate body fat using the Navy tape-measure method.
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Waist-to-Hip Ratio
Check your ratio against WHO risk categories.
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Body Frame Size Calculator
Find your small, medium, or large frame size.
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Body Roundness Index
A newer alternative to BMI using waist, height, and hip.
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Water Intake
Get a daily hydration goal and log glasses as you drink.
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BMR / TDEE
Find your daily calorie needs and a personalized macro split.
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Protein Intake Calculator
Find your daily protein target based on body weight and goal.
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Calories Burned Calculator
See how many calories you burned during any activity.
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Sleep Calculator
Find your ideal bedtime or wake-up time by sleep cycle.
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Nap Calculator
Find your ideal nap length and wake-up time.
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Pregnancy Due Date
Estimate your due date and track gestational age week by week.
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Pregnancy Weight Gain
See your recommended pregnancy weight gain range.
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Period Tracker
Estimate your next period, ovulation day, and fertile window.
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Height Predictor
Estimate a child's adult height from parents' heights.
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Blood Pressure Calculator
Check your reading against AHA blood pressure categories.
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Heart Age Calculator
See how lifestyle factors compare your heart age to your real age.
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ASCVD Risk Calculator
Estimate your 10-year heart disease and stroke risk tier.
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Target Heart Rate Zone
Find your personalized training zones using the Karvonen formula.
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Heart Rate Recovery
Measure your post-exercise cardiovascular fitness.
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Breath Holding Test
Time how long you can hold your breath and see how it compares.
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Running Pace Calculator
Calculate your pace, speed, and predicted race times.
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Symptom Checker
Get an urgency level based on your symptoms, age, and history.
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Mental Health Survey
A private PHQ-9 / GAD-7 depression & anxiety screening.
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Fertility Checklist
Check lifestyle factors linked to sperm health and track over time.
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Grip Strength Calculator
Benchmark your handgrip strength by age and sex.
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One-Rep Max Calculator
Estimate your 1RM using the Epley and Brzycki formulas.
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Push-Up / Sit-Up Test
Benchmark your push-up or sit-up count by age and sex.
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BAC Calculator
Educational blood alcohol content estimate.
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A1C Converter
Convert between A1C and average blood sugar.
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